The L.H. Dottie ZA200 Anchor has a 1/4-inch diameter and 2-inch length. Fits a 1/4-inch drill size. Made of zamac alloy with carbon steel pin. Zamac anchors have better shear resistance than plastic pin anchors. Use for concrete, block, brick, stone. Not recommended for ceiling applications. This listing is for a standard package containing 100 units.